Polar Express Hot Chocolate

Bahan-bahan (4 porsi)

• 4 1/2 cups half and half or whole milk
• 1/2 cup mini semi-sweet chocolate chips
• 1/4 cup unsweetened cocoa powder
• 1/4 cup chopped dark or milk chocolate
• 2 -3 tablespoons hazelnut liqueur
• 1 tablespoon vanilla extract
• 1 cup whipped cream, and lots more for serving
• flaky salt